Towards “green” viscoelastically prestressed composites: Cellulose fibre reinforcement
Qin, Yang; Fancey, Kevin S.
Dr Kevin Fancey K.S.Fancey@hull.ac.uk
With growing concerns over environmental issues, fibre reinforced composites based on renewable, biodegradable low-cost cellulosic/cellulose fibres increasingly attract interest. This paper reports on the first study to produce viscoelastically prestressed polymeric matrix composites (VPPMCs) using regenerated cellulose/viscose continuous fibres. The aim was to demonstrate that this prestressing technique could improve the mechanical properties of a cellulose fibre reinforced composite without the need to increase section mass or thickness. By investigating the viscoelastic properties of cellulose yarn, a suitable load was applied to subject the fibres to tensile creep. The load was then released and the loose yarns were moulded into a polyester resin matrix. Following matrix solidification, the viscoelastically recovering fibres imparted compressive stresses to the matrix. The mechanical properties of these cellulose fibre VPPMCs were investigated by tensile, three-point flexural and Charpy impact tests. Under the creep conditions investigated, the VPPMC samples demonstrated up to 20% increase in tensile strength and modulus and a comparable improvement in flexural properties, compared with control (unstressed) counterparts. Nevertheless, the prestress effect reduced impact toughness by ~30%, by impeding matrix crack formation and promoting fibre fracture. Based on findings from this paper, all-green VPPMCs may be achieved in the future by considering potentially suitable green resins.
|Journal Article Type||Article|
|Publication Date||Dec 1, 2018|
|Journal||Composites Part B: Engineering|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Qin, Y., & Fancey, K. S. (2018). Towards “green” viscoelastically prestressed composites: Cellulose fibre reinforcement. Composites. Part B, Engineering, 154, 439-448. doi:10.1016/j.compositesb.2018.08.096|
|Keywords||Polymer-matrix composites (PMCs); Residual/internal stress; Mechanical testing; Viscoelasticity|
|Additional Information||This is the accepted manuscript of an article published in Composites part B: engineering, 2018. The version of record is available at the DOI link in this record.|
©2018, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/